梁

In a sentence

• 梁是一种常见的建筑构件，用于承载上方的重量。

  A beam is a common structural component used to support the weight above it.

  Here, '梁' refers to a structural 'beam' used in buildings and engineering.

• 这座桥的桥梁是用钢材制作的，非常坚固。

  The bridge's beam is made of steel and is very sturdy.

  In this context, '梁' means the 'beam' or 'girder' of a bridge, highlighting its engineering usage.

• 张先生是个乐于助人的人，他是我们社区的栋梁。

  Mr. Zhang is a helpful person; he is a pillar of our community.

  Here, '栋梁' uses '梁' metaphorically to mean 'pillar' or someone who is a vital support or strength in a community.